Equity Details about AOCI Components Reclassified to Net Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
Details about AOCI Components Reclassified to Net Income
Interest income/(expense), net	$ 62	$ (54)	$ 111	$ (126)
Primarily revenue	11,649	10,554	23,958	21,895
Other income/(expense), net	(37)	10	(31)	(92)
Income taxes	1,119	654	2,155	1,244
Net income	1,917	1,513	3,757	2,895
Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Net income	55	(57)	77	(130)
Gain/(loss) in net income from Investments, net | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Interest income/(expense), net	92	11	151	11
Income taxes	(34)	(4)	(56)	(4)
Net income	58	7	95	7
Gain/(loss) in net income from Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Primarily revenue	33	14	49	24
Income taxes	(12)	(5)	(18)	(9)
Net income	21	9	31	15
Gain/(loss) in net income from Pension and postretirement medical expense | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Primarily included in the computation of net periodic benefit cost	(38)	(115)	(78)	(231)
Income taxes	14	42	29	85
Net income	(24)	(73)	(49)	(146)
Gain/(loss) in net income from Foreign currency translation and other | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Other income/(expense), net	0	0	0	(10)
Income taxes	0	0	0	4
Net income	$ 0	$ 0	$ 0	$ (6)